APA

Lundh J. P., . (1970). A new variety of Opuntia megasperma from the Galápagos Islands. : .

Chicago

Lundh J P, . 1970. A new variety of Opuntia megasperma from the Galápagos Islands. : .

Harvard

Lundh J. P., . (1970). A new variety of Opuntia megasperma from the Galápagos Islands. : .

MLA

Lundh J P, . A new variety of Opuntia megasperma from the Galápagos Islands. : . 1970.